With the current low prices for servers and the need for processing power, even a small company may end up with quite a few of them. If ten years ago it was still common to see an entire company using just one server, these days that's no longer the case.
New computers are added to the network with the understanding that they will be taken care of by the admins. Keeping an eye on these servers is a tedious, time-consuming process. Even with 5 minutes per server (to check the logs and other parameters), it may take an hour to make sure that everything is ok and no "red lights" are blinking on any of the servers.

Comments:EventID.Net
From a newsgroup post: "This might be a problem with your ISP. Test downloading mail from your private POP3 account using the SBS POP3 connector and see if it works fine. If it does then this problem might not be related to you, but rather to your ISP".